add file position info to proc
[linux-2.6] / fs / proc / mmu.c
1 /* mmu.c: mmu memory info files
2  *
3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells (dhowells@redhat.com)
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  */
11
12 #include <linux/types.h>
13 #include <linux/errno.h>
14 #include <linux/time.h>
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/mman.h>
18 #include <linux/proc_fs.h>
19 #include <linux/mm.h>
20 #include <linux/mmzone.h>
21 #include <linux/pagemap.h>
22 #include <linux/swap.h>
23 #include <linux/slab.h>
24 #include <linux/smp.h>
25 #include <linux/seq_file.h>
26 #include <linux/hugetlb.h>
27 #include <linux/vmalloc.h>
28 #include <asm/uaccess.h>
29 #include <asm/pgtable.h>
30 #include <asm/tlb.h>
31 #include <asm/div64.h>
32 #include "internal.h"
33
34 void get_vmalloc_info(struct vmalloc_info *vmi)
35 {
36         struct vm_struct *vma;
37         unsigned long free_area_size;
38         unsigned long prev_end;
39
40         vmi->used = 0;
41
42         if (!vmlist) {
43                 vmi->largest_chunk = VMALLOC_TOTAL;
44         }
45         else {
46                 vmi->largest_chunk = 0;
47
48                 prev_end = VMALLOC_START;
49
50                 read_lock(&vmlist_lock);
51
52                 for (vma = vmlist; vma; vma = vma->next) {
53                         unsigned long addr = (unsigned long) vma->addr;
54
55                         /*
56                          * Some archs keep another range for modules in vmlist
57                          */
58                         if (addr < VMALLOC_START)
59                                 continue;
60                         if (addr >= VMALLOC_END)
61                                 break;
62
63                         vmi->used += vma->size;
64
65                         free_area_size = addr - prev_end;
66                         if (vmi->largest_chunk < free_area_size)
67                                 vmi->largest_chunk = free_area_size;
68
69                         prev_end = vma->size + addr;
70                 }
71
72                 if (VMALLOC_END - prev_end > vmi->largest_chunk)
73                         vmi->largest_chunk = VMALLOC_END - prev_end;
74
75                 read_unlock(&vmlist_lock);
76         }
77 }